Sheet-metal-scroll cutter



(No Model.)

A. 0. KITTREDGE.

sEEET METAL SGEOLL GUTTER.

No. 362,976 Patented May 1'7, 1887.

NiTnD TATES PATENT Fries@ ANSON O. KITTREDGE, OF SLATE HlLL, NEW YORK, ASSIGNOR TO THE YULOAN COMPANY, OF PHLADELPHIA, PENNSYLVANIA.

SHEET-METAL-SCROLL CUTTER.

SPECIFICATION forming part of Letters Patent No. 362,976, dated May 17, 1887. e

Application filed Septembtr 4, ISEO.

T all whom it may concern:

Be it known that I, ANsoN O. KHTREDGE, a citizen of the United States, residing at Slate Hill, Orange county, New York, have invented certain new and useful Improvements in Sheet- Metal -Scroll Cutter Attachments, fully described and represented inthe following specification andthe accompanying drawings, forming a part of the same.

This invention relates to that class of shectmetal-cutting machines in which an upper .eutter is reciprocated continuously in contact with a lower cutter surrounded by a worktable; and the present improvements consist, first, in an improved means of applying the work-table around the cutter, in an improved means of holding the lower cutter inovably but firmly in such table, and for sustaining the edge ot' the sheet metal adjacent to the cutters, and in means for vertically adjusting the lower cutter to separate it entirely from the upper cutter, or to hold it in any desired relation thereto. v

The invention will be understood by reference to the annexed drawings, in which- Figure l is a side elevation ol' the machine embodying my improvement. Fig. 2 isafront elevation of the same, and Fig. 3 is a plan of the same with the parts above the line x fc in Fig. l removed. Fig. i is a front elevation of the front end ot the bed, the adjusting-slide and its link, and thedie for holding the lower cutter, the parts being shownin section where hatched at the center of the cutter. Fig. 5 is a plan of the front end only ofthe bed, showing the die secured thereon with the adjustingslide dotted beneath it.

A is the bed of the machine sustaining the table B and the gooseneck O, carrying a re ciprocating slide, D, which is driven by a shaft, D', and by a pulley, D?, which reciprocates the slide by a crank-pin, d, in the usual manner.

a is the upper cutter, e the lower cutter, b the die, and c the adjusting-slide. The die is shown in Fig. 5 as a circular disk secured upon the front end ot' the bed by screws f, and slotted at g to snugly fit the lower cutter, which is secured in the upper end of the slide c and projected through the die, with its left-hand side in Contact with the opposed side of the cutter Serial No. 212,671. (No model.)

c. The upper face of the lower cutter is substantially tlat; but the lower end of the upper cutter is inclined to produce a shearing eut, and is reciprocated with a short and rapid stroke to eut smoothly when the sheet metal is fed thereto.

The cutter c fits snugly in a vertical slot, 71, in the upper end of the slide, and is clamped therein by a set-screw, t'. (Shown in Fig. 5.)

The table B is divided transversely at the line of thc cutters, its rear halt being` attached directly to the bed A, as by screws j; but the front halt is hinged, as by lugsp, to the l'ront end of the bed A, so that it may be turned down, as represented by dotted lines B in Fig. l. Such movement at'l'ords the operator a closer access to the cutters for presenting intricate scribed work thereto, and also all'ords access more conveniently to the slide c and die b. Vhen elevated, the table may be supported by draw-bars F, which are fitted in sockets G under the rear half of the table, and are provided with handles F to pull them forward.

The slide c is moved up and down vertically or held in a [ixed position, at the pleasure ot' the operator, by means of a treadle, H, and a spring, I, the treadle being raised normally by the spring and depressed by the l'oot ofthe operator.

The bed is sustained upon a frame or legs, A', to the rear part of which the treadle is pivoted at H, and upon the front part of which, at 7c, a lever, J, is pivoted, and connected, respectively, by links Z and m with the slide c and treadle H. The lever J operates to reverse the movement of the treadle, so that the depression of the latter raises the slide c and lifts the lower cutter into 'contact with the reciprocating cutter A. A rack, n, is secured adjustably upon the front of the frame A by bolts o, and the side of the treadle is tted to notches upon such rack, so as to be locked thereby in any desired position.

The operator may readily throw the treadle into contact with the rack or ont of the same by a lateral movement of his foot, and. the disengagement of the treadlc from the rack thus permits the spring I to operate and separate the entters,'so that the sheet metal may be introduced between them. A cut may then IOC) 2 j v 362,976 v be commenced within the margin of the sheet by depressing the treadle until the cutters engage, and moving the sheet metal in the desired direction.

The upper cutter, being made with a sloping edge and havingadefinitestroke,will obviously make a longer or shorter cut at each stroke in proportion to the elevation ot' the lower cutter when in contact with it, the longer cut being preferable for rapid work upon straight lines, but the shorter cut, corresponding to a narrow lap of the two cutters, being more suitable for cutting around curves, especially when the latter are of short radius.

To guide the operator in depressing the treadle to a specific point, a set-screw, s, is arranged to check the movement of the treadle, and may be adj usted to operate at any desired point. When the treadle is thus stopped by the set-screw, a tooth of the rack n may be adjusted to it by shifting the rack beneath the heads of the bolts o, and the treadle may thereafter be readily stopped and held in thc desired position without further attention from the operator. f l

It is evident that other constructions may be devised for locking the treadle in any required position, and I do not therefore limit myself exclusively to the means shown herein, as the essential part of my invention is the readjustment ofthe cutters, after their separation, to the required position to operate upon sheet metal in the desired manner.

It is obvious that the die may be dispensed with by extending the slide c through the table B; but in such case the lower cutter would not be held so rigidly or accurately incontact with the reciprocating cutter as if it were fitted directly to a slot in a stationary piece, like the die b.

The lower cutter requires a very slight movement to permit the introduction of the sheet metal, and as in my construction the die is rigidly secured to the solid bed of the machine, and the slot g is formed through it to accurately tit the cutter, the latter is sustained in the desired relation to the cutter a in the most effective manner when in operation.

I do not make a broad claim herein tothe combination, with a vertically-movable spindle sustaining the lower cutter, of means located beneath the work-table for shifting the lower cutter and actuated by the lower limb of the operator, as I have made such invention the subject of a separate patent application, No. 212,670, co-pending herewith.

Having thus set forth my invention, what I claim is as and forthe purpose set forth:

1. In asheet-metal-scroll cutter, the combi- I nation', with a bed sustaining a work-table and a lower cutter and a goose-neck sustaining a reciprocating upper cutter, of a dieperforated for the passage of the lower cutter and secured upon the front end of the bed and projected through the table, as and for the purpose set forth.

2. In a sheet-metal-scroll cutter, the combination, with a bed sustaining a lower cutter and a goose-neck sustaining a reciprocating upper cutter, of a table adjusted about the lower cutter and having its front half hinged, and provided with means for sustaining it in an operative position, as and for the purpose set forth.

3. In a sh'eet-metal-scroll cutter, the combination, with the bed A and goose-neck C, sustaining a reciprocating upper cu ttor, of a movable slide fitted in the bed A and sustaining the lower cutter, and a treadle arranged and operated to move the slide vertically, as and for t-he purpose set forth. i

4. In a sheet-metal-scrollcutter, the combination, with the bed A and goose-neck C, sustaining a reciprocating upper cutter, of a movable slide fitted in the bed A to sustain the lower cutter, a table supported upon the bed above the slide, and a die affixed upon the bed and extending through the table, and perforated to fit t-he lowcrcutter and hold it in position, as and for the purpose set forth.

5. In a sheet-inetalscroll cutter, the combination, with the bed A and goose-neck C, sustaining a reciprocating upper cutter, of a movy able slide fitted in the bed A and sustaining the lower cutter, a treadle arranged and operated to move the slide vertically, and means position,

for locking the treadle in the desired 6. In a sheet-metal-scroll cutter, the combination, with the bed A and goose-neck C, sustaining a reciprocating upper cutter, of a movable slide fitted in the bed A and sustaining the lower cutter, a treadle arranged and op- IOO erated to move the slide vertically, adjustable means for arresting the downward movement ofthe treadlc, and means for locking the same in any required position, as and for the purpose set forth. 1

In testimony whereof yI have hereunto set myhand in `the presence of two subscribing witnesses.

ANsoN o. KITTREDGE. 

